Surname Demoulin (Demoulin 
) , around the globe, is quite a common cognomen. The family name Demoulin is habitual in Western Europe, particularly Belgium, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and France. Measured by absolute frequency, the name is most common in France, Belgium, and the United States. Very seldom, Demoulin is the forename as well as the last name.
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| Demoulin | Germany, Belgium, Ghana, United States, France |
| jérôme-rené demoulin French painter (1758-1799), FR (b. 1758) |
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joseph demoulin BE (b. 1825) |
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albert demoulin French politician, FR (b. 1863) |
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| gustave demoulin (b. 1817) |
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jacques demoulin French painter (1905-1991), FR (b. 1905) |
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| alphonse demoulin Belgian mathematician, BE (b. 1869) |
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| émile demoulin Belgian politician, BE (b. 1870) |
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| simone demoulin French Righteous Among the Nations, FR (b. 1906) |
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| marcelin demoulin Belgian politician, BE (b. 1908) |
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| robert demoulin Belgian historian, BE (b. 1911) |
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| charles demoulin FR (b. 1904) |
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| georges demoulin French entomologist (1919-1994), BE (b. 1919) |
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| vincent demoulin botanist (b. 1946) |
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| florence demoulin-auzary French legal historian, FR (b. 1950) |
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| christian demoulin (b. 1942) |
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